1 Hour - Ceiling Radiation Damper
The RD-521-NP90 ceiling radiation damper employs butterfly style blades for point-of-origin control of radiant heat in HVAC systems. The RD-521-NP90 is installed horizontally in the ceiling membrane of combustible floor-ceiling or roof-ceiling assemblies with fire resistance ratings up to and including 1 hour. The RD-521-NP90 must have a field supplied outlet box installed on it.
Frame: 22 gauge (0.85) galvanized steel.
Blades: 22 gauge (0.85) galvanized steel – butterfly. Insulated with ceramic refractory material.
Transition: None (field adaptation required).
Plaster Ground: 5/8" (16) deep × 7/8" (22) wide std.
Closure Device: Fusible link.
Fire Closure Temperature: 165°F (75°C).
Minimum Size: 4" × 6" (102 × 152)
Maximum Size: Square: 12" × 12" (305 × 305) 14" (356) W or 10" (254) H with a maximum area of 144 in2. (929 cm2)
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